2-Propenoic acid, 2-methyl-, 2-((1,1-dimethylethyl)amino)ethyl ester, polymer with methyl 2-methyl-2-propenoate and 2-methylpropyl 2-methyl-2-propenoate 68516-42-7 Isobutyl methacrylate, methyl methacrylate, tert-butylaminoethyl methacrylate polymer